[core] Attribute: Fix the attribute removed by accident

Author: nicolas-lambert-tc

meshroom/core/attribute.py

@@ -480,6 +480,7 @@ def updateInternals(self):
     linkedInAttributes = Property(Variant, getLinkedInAttributes)
     linkedOutAttributes = Property(Variant, getLinkedOutAttributes)
     isDefault = Property(bool, _isDefault, notify=valueChanged)
+    linkParam = Property(BaseObject, getLinkParam, notify=isLinkChanged)
     rootLinkParam = Property(BaseObject, lambda self: self.getLinkParam(recursive=True), notify=isLinkChanged)
     node = Property(BaseObject, node.fget, constant=True)
     enabledChanged = Signal()